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Temperature Probe not detected on an AP9631 that was pre-installed in a Symmetra

Issue
An issue has been identified with AP9631's that come pre-installed in a single phase Symmetra unit - when connecting the temperature probe to either UIO port, the NMC web UI will show either "Communication Loss", or will show a temperature probe is connected, but not give any temperature reading:

Cause
These NMC's have a bug that do not allow them to see exactly how many UIO ports they have, which causes this behavior. Other UIO accessories, such as the AP9613 dry contact dongle, will also not work. The NMC will function as expected in all other ways, this issue only affects the UIO ports.

Resolution
This issue has been resolved in firmware with AOS v6.5.0+. Upgrading the firmware will immediately resolve the problem. The latest revision of firmware can be found on apc.com, or available via the Data Center Expert (DCE) catalog.